30 lines
1.1 KiB
Rust
30 lines
1.1 KiB
Rust
use crate::spec::LeafEnumBuildSpec;
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use crate::util::{make_build_fn_name, make_build_pair};
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use proc_macro2::TokenStream;
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use quote::{format_ident, quote};
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pub fn make_leaf_enum_build_fn(leaf_enum_build_spec: &LeafEnumBuildSpec) -> TokenStream {
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let build_fn_ident = format_ident!("{}", make_build_fn_name(leaf_enum_build_spec.build()));
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let pair_ident = format_ident!("{}", make_build_pair(leaf_enum_build_spec.build()));
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let return_type_ident = format_ident!("{}", leaf_enum_build_spec.build());
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let rule_branches = leaf_enum_build_spec.rules()
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.map(|leaf_enum_rule| {
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let rule_ident = format_ident!("{}", leaf_enum_rule.rule());
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quote! {
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Rule::#rule_ident => #return_type_ident::#rule_ident
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}
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})
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.collect::<Vec<_>>();
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quote! {
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fn #build_fn_ident(#pair_ident: Pair<Rule>) -> #return_type_ident {
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let inner_pair = #pair_ident.into_inner().next().unwrap();
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match inner_pair.as_rule() {
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#(#rule_branches,)*
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_ => unreachable!()
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}
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}
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}
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}
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